NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days — NPA 341
NEW CINGULAR WIRELESS PCS, LLC 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2020-05-28 341-356 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H FRNK MAIN CA
2020-05-28 341-766 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H OKLD BKLY CA
2020-05-27 341-799 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H RICHMOND CA
2019-12-30 341-666 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H OKLD TRNID CA
2019-12-03 341-222 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H OKLD FRTVL CA
2019-12-03 341-444 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H CROCKETT CA
2019-12-03 341-800 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H HAYWARD CA
2019-08-21 341-333 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H OKLD BKLY CA
2019-07-22 341-999 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H RICHMOND CA
2019-06-07 341-888 0–9 XXXall 10 · 4 holders which blocks → WIDE VOICE, LLC - CA 252F FRNK MAIN CA
2019-05-31 341-777 0–9 XXXall 10 · 7 holders which blocks → WIDE VOICE, LLC - CA 252F HAYWARD CA
— 341-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 341-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 341-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 341-510 not yet reported which blocks → CA
— 341-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 341-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST CA
— 341-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 341-700 not yet reported which blocks → CA
— 341-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 341-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 341-895 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C OKLD ALMD CA
— 341-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 341-950 not yet reported which blocks → CA
— 341-958 not yet reported which blocks → CA
— 341-959 not yet reported which blocks → CA
— 341-976 not yet reported which blocks → CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.